On 13.07.2020 09:40, Florian Weimer wrote: > * Richard Biener: >>> 2. I have a library with AVX2 and FMA, which directory should it go? >> >> Eventually GCC/gas can annotate objects with the lowest architecture >> level that is applicable? > > H.J. has patches for ELF program properties. I think > GNU_PROPERTY_X86_ISA_1_NEEDED would convey this information. This > proposal and the glibc patches are independent of that.
>From (partly just halfway) recent discussions with H.J. I gained the understanding that the piece we're aiming at getting to work properly is the recording of GNU_PROPERTY_X86_FEATURE_2_*, not so much GNU_PROPERTY_X86_ISA_1_*. If the ISA one is to be used as a basis here, a lot of new flags will need adding (and properly setting) first, I think. Jan
